TM 5-2420-230-24-1
Table 3-6. Unit Troubleshooting Table. -- Continued
Malfunction
Test or Inspection
Corrective Action
25.
NOISY HYDRAULIC COOLING FAN.
Step 1.
With engine stopped, check hydraulic fan motor (1) to ensure it is functioning properly by rotating fan
blade. After initial resistance, blades should move freely.
If no initial resistance is felt, replace damaged woodruff key(s) (2) (Para 9-6).
Step 2.
Check hydraulic fan motor (1) for 3,200 psi (22 063 kPa) at high idle at hydraulic fan motor test port (3)
with a pressure gauge capable of measuring 0 to 3,500 psi (0 kPa to 24 132 kPa).
If pressure at hydraulic fan motor test port (3) is less than 2,900 psi (19 995 kPa) at high idle, replace
hydraulic fan motor (Para 9-6).
Change 1